[libcamera-devel] [PATCH v6 04/15] pipeline: raspberrypi: Reorder startup drop frame initialisation

[Naushir Patuck]

Reorder the code such that the IPA requested startup drop frames count is
available before the pipeline handler allocates any stream buffers.

This will be used in a subsequent change to stop Unicam buffer allocations if
there are no startup drop frames required and the application has configured a
raw stream and always provides buffers for it.

Signed-off-by: Naushir Patuck <naush at raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
---
 .../pipeline/raspberrypi/raspberrypi.cpp      | 30 +++++++++----------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
index 9e959782d310..8aa83aa76ae0 100644
--- a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
+++ b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
@@ -1041,21 +1041,6 @@ int PipelineHandlerRPi::start(Camera *camera, const ControlList *controls)
 	RPiCameraData *data = cameraData(camera);
 	int ret;
 
-	for (auto const stream : data->streams_)
-		stream->resetBuffers();
-
-	if (!data->buffersAllocated_) {
-		/* Allocate buffers for internal pipeline usage. */
-		ret = prepareBuffers(camera);
-		if (ret) {
-			LOG(RPI, Error) << "Failed to allocate buffers";
-			data->freeBuffers();
-			stop(camera);
-			return ret;
-		}
-		data->buffersAllocated_ = true;
-	}
-
 	/* Check if a ScalerCrop control was specified. */
 	if (controls)
 		data->applyScalerCrop(*controls);
@@ -1072,6 +1057,21 @@ int PipelineHandlerRPi::start(Camera *camera, const ControlList *controls)
 	/* Configure the number of dropped frames required on startup. */
 	data->dropFrameCount_ = startConfig.dropFrameCount;
 
+	for (auto const stream : data->streams_)
+		stream->resetBuffers();
+
+	if (!data->buffersAllocated_) {
+		/* Allocate buffers for internal pipeline usage. */
+		ret = prepareBuffers(camera);
+		if (ret) {
+			LOG(RPI, Error) << "Failed to allocate buffers";
+			data->freeBuffers();
+			stop(camera);
+			return ret;
+		}
+		data->buffersAllocated_ = true;
+	}
+
 	/* We need to set the dropFrameCount_ before queueing buffers. */
 	ret = queueAllBuffers(camera);
 	if (ret) {
-- 
2.25.1